States in ${}_{}{}^{12}{}_{}{}^{}\mathrm{C}$ at 12.71, 16.11, 18.38, 19.55, and 20.62 MeV were populated strongly in the ${}_{}{}^{11}{}_{}{}^{}\mathrm{B}$(d,n${)}^{12}$C reaction at a laboratory beam energy of 12 MeV. The charged-particle decays of these states were measured in coincidence with neutrons detected by time of flight techniques at 0° relative to the beam. Decay protons and α particles were detected and identified in a surface-barrier counter telescope placed at laboratory angles of 45°, 60°, 85°, 110°, and 135°. Angular correlations and branching ratios were determined for the decay particles. The 19.55 MeV peak contains at least two states 300 keV apart with very different α and proton decay rates. An α decay branch to the ground state of ${}_{}{}^8{}_{}{}^{}\mathrm{Be}$ indicates the presence of a natural parity state in the 18.38 MeV peak. Comparisons have been made between the measured angular correlations and calculations based on the ${}_{}{}^{12}{}_{}{}^{}\mathrm{C}$ alignments predicted by the distorted-wave Born approximation.

• Received 21 June 1984

DOI:https://doi.org/10.1103/PhysRevC.31.334